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Plus and minus sign for an equation

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Rooy
Rooy 2012-3-18
评论： Walter Roberson 2018-4-27
I need the plus and minus sign before the square root function, am I doing it right?
a=((xx+yy)/2)+sqrt((((xx+yy)^2)/2)+xy^2);
a=[a,-a];

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Walter Roberson
Walter Roberson 2012-3-18
No.
t1=((xx+yy)/2);
t2=sqrt((((xx+yy)^2)/2)+xy^2);
a=[t1+t2, t1-t2];

更多回答（1 个）

Naresh Virothi
Naresh Virothi 2018-4-27
how to type plus or minus symbol in matlab
  2 个评论
John D'Errico
John D'Errico 2018-4-27
Please don't add an answer just to ask a question.
And there is no plus OR minus symbol in MATLAB, that is, a symbol that indicates EITHER plus or minus.
Unless of course you just mean a string.
'+/-'
ans =
'+/-'
Walter Roberson
Walter Roberson 2018-4-27
>> char(177)
ans =
'±'
However, this has no significance to equations and will be rejected as an error in source code except in comments or character vectors or string objects.
If you need this for labels, then, for example,
text(0.5,0.5,'$\pm$','interpreter','latex')
If you need the minus on top and the plus underneath then \mp

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